Wrench



nutren sra'rns rarnnfr cerros.

DAN P. FOSTER, OF SHELBURNE FALLS, MASSACHUSETTS.

WRENCH.

Specification forming part of Letters Patent No. 22,947, dated February 15, 1859i; Ressued June 16, 1874, No. 5,914.

To all whom t may concern:

Be it known that I, DAN P. FOSTER, of Shelburne Falls, in the county of Franklin and State of Massachusetts, have invented certain new and useful improvements in the construction of screw-wrenches, so as to make them self-adjusting and cause them to firmly hold onto round as well as square forms, and that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure l, representsthe wrench when its jaws are parallel, and Fig. 2, represents the same, when the points of the aws are nearer together than their heels, as `they will be when holding round forms.

Similar letters of reference where they occur in the separate figures denote like parts of the wrench in both the drawings.

My invention consists in the manner in which l hang the movable aw, to the rigid or immovable one-viz: so that it may not only move to or from the Xed jaw, but change its relative position thereto, so as to grasp and hold other forms than square ones, as will be described.

To enable others skilled in the art to make and use my invention, I will proceed to describe the same with reference to the drawings.

A represents the shank of the wrench to which the handle B, is affixed. The eXtreme end of this shank piece, is turned at nearly right angles tothe shank, to form the stationary jaw C, and through this aw C, there is an opening, large enough to admit .the shank D, of the movable jaw E, and allow the shank free play therein.

F is a loop or guide connected to the shank A, and the rear end of the shank D, passes through it, and has space to move in, as its jaw is strained tight down against the stationary jaw.

There is a hinged joint at @upon which the movable jaw and its shank worksas follows: On the stationary jaw C, there is a rounded projection c against which a rounded depression c, on the washer f, snugly fits, and the thumb nut G, holds the washer f tight up against the projection c, while the rear of the thumb nut bears against the loop or guide F.

g, is a spring for forcing out the shank D, and thus keeping its jaw parallel with the stationary one, as shown in Fig. l. The thumb nut G, runs on a screw thread out on two sides of the shank D, in t-he common well known way and moves the j aw E, from or toward the jaw C. The opposing faces of the jaws may be roughened in :any of the usual ways, to cause them to take a firmer hold, or they may be smooth when designed to be used on nuts.

This wrench will hold round, yas well as square or flat iron, the whole power, applied to it, tending to make the jaws the more tightly hold whatever may be between them. rlhe part c' of the shank D may also be roughened, as seen in the drawings.

lfVhen the wrench is to be used, its jaws are placed over or around the article to be held or turned, in the position shown in F ig. l. Power being applied to the wrench, the tendencyof the movable jaw E, is, to approach at its point the stationary jaw C as shown in Fig. 2, and this causes the jaws to more tightly hold whatever may be between them. The openhinged joint at @,admits of the movable jaws rocking at said joint and yet it in nowise interferes with the action of the thumb nut Gr, or washer f.

I thus make a very cheap, and efiicient wrench, that will firmly hold between its jaws round as well as square and flat bars, pieces, or articles, such as pipes, tubes, rods, nuts, &c. &c.

Having thus fully described the nature and object of my invention, what l claim therein as new and desire to secure by Letters Patent is Making the hinge joint between the stationary and movable jaw of the wrench at -viz: by the projection c on the .stationary jaw and the depression c, in the Washer that is on the shank of the movable jaw, for the purpose of allowing the movable jaw to change its position in relation to the stationary one as herein set forth, and for the purpose explained.

DAN P. FOSTER.

Witnesses:

H. S. GREENLEAF, C. C. TOLMAN.

[FIRST rRINTED 1911.] 

